Machine for measuring surface areas



Dec. 4, 1923. 1,476,428

H. THUN MACHINE FOR MEASURING SURFACE AREAS Filed June 21 1922 HE E Patented Dec. 4-, 1923.

P marten ,STu ATIlES .e-ArE .oFFlcE.

swam THUN,

or Essen. GERMANY, ,ASSIGNOR TO ERIED. KRUPP'AK'rrENeEsELL- sex sm, or ESSEN-ONTTHErBUI-IR, GERMANY.

MACHINE FOR"MEASURING sunrises nne's.

"To all whom it. may concern: i

Be atlmown that 1, HERMANN Tl-IUN, residin-gat Essen, Germany, a citizenof the I German Republic, have invented; a. i certain 5 new and useful l mprovement antMachines for Measuring Surface Areas,of.which the.

: following is-a specification.

' 'Tllls mven'tronmelates to machines for i measuring surface areas, more particularly 1 H designed for measuring the. superficial 1 area of leather and being of a ikin'd. comprising a plurality of equidistantly arranged. con- 3 tact wheels or feelers which. are. [adapted to actuate measuring inembers 'when they are 4 lifted from a dr iving drumeby the: article I to be measured.

I On

It is a well-known fact that in surface measuring 'IIItIChIHGS of the kind stated, there I is involved an error, the so-called no error of brea dth .which depends on the breadtl'i of the contact wheelsv or .ofeelers. 'This error can be substantially.eliminated by having each 1 two neighbouring contact wheels or & feelers connected with one; meas- :3nring member. /Vith such construction,

however, a certain space exists. between the two contact wheels-or feelersacting 011.121. measuring -1nember, :this space entailing a-11otl1er-erro-1'. This error. consists in that,

so if the surface to be measured has. an oblique edge, the release of a measuringmember will not, as it should be for iavoidingcevery possible error,= take place at thevmoment at wh'ich coincide the points of intersection n touch between thedriving drum and the contact wheels or -feelers-on theione :hand and the plane-standing vertical .withrelation to this'line ofw-touch in the. .middle between the two contact wheelsior feelers acting on the respective measuring member onthe other hand, but saidreleaseiwill. only the respectiveedge with thelline 10f ;F;ig. 1;.isia'cross-section ofthe: machine, ithei parts havingno ;bearing, on the invention ebeing omitted and --F ig. 2,- is;a plan;view corresponding to 5 Fl 1,." partly; inI-section.

r eferringiinowtosthe drawing,.A is the driving drum onwhich "rest. in equal. diszitancesibeside one anothercontact wheels B, 13 ,13 ,B representing the first contact wheel of themachine, The contact, wheels are mountedyforirotation ion levers Q, C ,..C whichare adaptedtorock on a fixed shaft D; and" which carry-each, besides one contact wheel,;.a -.p,inioniE, EFJE, rigidly connectedwiththecontact wheel. Arranged 0ppositely to each pinion is a,measuring. membernformedlby. a-spur-iwheeLF, P F .which, when rotated ina well-known manner, ,will .act .on van wadding mechanism ;throughthe intermediary of ;.a roller G rigidly fastened to it. and-a measuring band [H which isiadapted to be wound 1 on the :lfOll'l'lG. ..The spnr.wheel F, F. ,.F are Lrotatively imountedoeachpatvone armcf a double-armed .lever.-J, J J the other arm ofwhichcarries aweight K, K .T-he leversid, J (are mounted for-.oscillation on fixed. shaft.M, theweights K, ;K tending to throw the spurwheels F, F into engagement with the. correspondiingrpinions,E,;E ,ln the position of the severalpartsillustrated in the drawing this .is, however, prevented; by .the arrangement illerei-nafter described. j I

.lThei'freeaendsof thelevers 0,.(1 and C carrying the zifirst, secondand third contact -.whe.el are :provided each 'with a setting screw 9N, -N ancl..N Bearingiagainst the wsettingficrewN under the influence-of the nveight K isainL-shaped;projectioni of the leveral, The setting-screwN is adjusted so ,aszto cause the spur wheelFzto be just out of engagement withithepinionE. Bearing iagainstather settingzscrew N under the influence of the weight K is a T-shaped projection i of the lever J The projection 2' not only bears against the setting screw N but also against the setting screw N The setting screws N and N are adjusted like the setting screw N so as to cause the spur wheel F to be just out of engagement with the pinion E The lever J possesses an L-shaped projection 71 which bears against a setting screw N under the influence of the Weight K the screw N being mounted in a head 0 forming the free end of the lever C The head 0 also carries another setting screw N against which bears a Tshaped projection 2' of the lever J under the action of the weight K The projection i likewise bears still against another setting screw N which is adjustably mounted in the free end of the lever C The setting screws N and N are in turn adjusted so as to cause the spur wheel F to be just out of engagement with the pinion E The lever J 4 again possesses an Lshaped projection 2'. Same is caused by the action of the weight K to bear against a setting screw l 6 which is mounted in a head a forming the free end of the lever C and which is adjusted in the same manner as the other setting screws. As will be evident from the foregoing, the spur wheels F, F F are only in engagement each with one contact wheel 13,13 and the contact wheel (not shown) which is carried by the lever C while the spur wheels F F are each adapted to be acted upon by two contact wheels B B and B B The arrangement is made in this way throughout the entire machine so that the measuring members are alternately in connect-ion with v one or two contact wheels, respectively. The

measuring movement of the twice-connected measuring members can therefore only be initiated .when two neighbouring contact wheels will come into contact with the surface to be measured. The error of breadth is thus compensated, but as already set forth in the introductory matter of the specification, another error is involved which causes the measuring result to be too small. If the contact wheels are of a breadth equal to the distance between them such as is the case with the embodiment shown, the said error will be equal to the error of breadth but opposed to the same. The measuring movement of the other half of the measuring members will now be initiated when the one corresponding contact wheel will enter into contact with the surface to be measured. This portion of the measuring members will therefore be thrown in too early in accordance with the error of breadth. As a result thereof, these measuring members will entirely balance the error caused by the other measuring members.

As will be understood from the foregoing,

the number of the measuring members which are in connection with only one contact wheel, depends upon the proportion between the breadth of the contact wheels and the breadth of the spaces lying between the same. If the contact wheel would, for instance, be five times as broad as the free spaces between them, the first, seventh, thirteenth etc. measuring member would each have to be acted upon by one contact wheel, while all of the other measuring members of which a number five times as large is present would have to be acted upon by two contact wheels each.

Claims: I

1. In a machine for measuring surface areas comprising a driving drum for guiding the article to be measured, equidistantly spaced feelers normally resting on said drum, and measuring members adapted to be actuated by said feelers when the same are lifted from the drum by the article to be measured, a portion-of the said measuring members being connected with one feeler each and a portion of them being connected with two feelers each, the dually operated members being proportioned to the singly operated members'substantially according to the proportion of the breadth of the feelers to the breadth of their spaced intervals.

2. In a machine for measuring surface areas comprising a driving drum for guiding the article to be measured, equi-distantly spaced feelers normally resting on said drum, a pinion coaxial with each of said feelers and adapted to rotate therewith, means for swingingly supporting said feelers, measuring members adapted to engage said feelers, means for bringing said measuring members into engagement with said pinions when said feelers are in working position, a portion of said measuring members being operable by one of said feelers each and the remainder being operable by two of said feelers each, the dually operated members being proportioned to the singly operated members according to the proportion of the breadth of the feelers to the breadth of their spaced intervals.

The foregoing specification signed at Essen, Germany, this 24th day of May, 1922.

HERMANN THUN. 

